動画講座Oro

The TreB method is a singing method originally developed by Riho Tagawa, adapting the singing method of La Scala in Milan to the Japanese bone structure and language, and by being aware of the three B principles, one acquires a beautiful voice that resonates effortlessly and far.

There are courses where you can learn the basics of TreB, TreB group lessons, etc.
First, beginners are recommended here.